mscorsvw.exe
Sources: 300M+ executions observed in the wild.
Summary
.NET Framework Optimization Service worker process. It pre-compiles .NET assemblies into native code in the background to improve application startup performance. It is the worker process spawned by ngen.exe to perform the actual compilation work.
mscorsvw.exe is the 16th most commonly executed Windows program in EchoTrail's dataset, observed 4,629,761 times across enterprise environments. It typically runs from C:\Windows\Microsoft.NET\Framework64\v4.0.30319 and it is most often launched by ngen.exe.
Get this in your tools
The same record for mscorsvw.exe, by REST or as an MCP tool. Free key, no card.
curl -H "Authorization: Bearer $ECHOTRAIL_KEY" \
https://api.echotrail.io/v1/process/mscorsvw.exeFree returns the summary. Team returns the full record you see on this page. Endpoint docs
Behavior
Top Paths
- C:\Windows\Microsoft.NET\Framework64\v4.0.3031955.26%
- C:\Windows\Microsoft.NET\Framework\v4.0.3031944.74%
- C:\Windows\Microsoft.NET\Framework\v2.0.50727<0.01%
Top Hashes (SHA256)
- 101c3e900ff5f2d29ac49dff4b95281637cf10aa8a19a6c84741bb5019aff29418.89%
- c35cfd9ab9897ce16a6a33bc92d9a49b66c6d9949fd9250acd6bcee4c32c63d815.36%
- 60def9905f16bd5d10684afea17ab3a9accdd8ba4a6e06240e84e3acb5f94e3d7.09%
- da1087ba2641efd77d85e5838aeb6c333e80caa9f24c889fd2de2e0b58f8d1a56.96%
- 097b622bfbc2b6717f0a7d01ffba0aa1a2a1d7e4b298df696250faa164ebc1fb6.29%
- 26175f1c85658ba787741fa7c7b297d105b985742e640201cb38fd6b3c17f0385.35%
- 70de04ea3453256d5153f19681d56d2f59bfd9a1ee01a6d1340e8ac5dfca20c84.98%
- 393729c6f0e4d018039fc0c81c6b3740d43224b2f5889c2d3376c94ef09985744.39%
- 3e5099f573601926e59862fba2495974688e72677c73f10e4c99e26a76cdcf374.33%
- ab17fe71cb14e54dbdd64d6a3a96ab7a84b4f2024aeeac3614659022c2bce0303.65%
Process Ancestry
Top Grandparents
- ngentask.exe96.6%
- services.exe2.73%
- msiexec.exe0.33%
- TiWorker.exe0.15%
- cmd.exe0.1%
- wininit.exe0.03%
- PerfWatson2.exe<0.01%
- setup.exe<0.01%
- svchost.exe<0.01%
Top Parents
- ngen.exe97.44%
- mscorsvw.exe2.52%
- services.exe0.03%
- filecoauth.exe<0.01%
- backgroundTaskHost.exe<0.01%
- svchost.exe<0.01%
- conhost.exe<0.01%
- iCUE.exe<0.01%
- smartscreen.exe<0.01%
- dxgiadaptercache.exe<0.01%
Top Children
- mscorsvw.exe99.97%
- conhost.exe0.02%
- WerFault.exe<0.01%
- ipconfig.exe<0.01%
- MusNotificationUx.exe<0.01%
- netsh.exe<0.01%
- RingCentral Classic.exe<0.01%
- tzutil.exe<0.01%
Security Analysis
What does mscorsvw.exe normally do?
Located in C:\Windows\Microsoft.NET\Framework64\v4.0.30319 or C:\Windows\Microsoft.NET\Framework\v4.0.30319. Launched by ngen.exe, other mscorsvw.exe instances (worker spawning), or services.exe (when running as a service). High CPU usage during compilation is expected and temporary.
When is mscorsvw.exe suspicious?
Running from a non-.NET Framework path. Launched by unusual parents. Spawning shells or network tools.
How do attackers abuse mscorsvw.exe?
Not commonly abused. Malware could potentially masquerade as mscorsvw.exe to explain high CPU usage.
Detection guidance
Low priority. Validate path is within .NET Framework directories.
False positive notes
High CPU usage is normal and expected — it is compiling .NET assemblies. Bursts of activity after Windows updates or application installations are standard.
Related Processes
Ask Rocky about mscorsvw.exe
Rocky is the free chat demo. It answers from this same dataset, no account needed.
This page is the Team-tier API record for mscorsvw.exe. The free tier returns the summary, 500 lookups a month. Or ask Rocky.